Timepiece movement with a balance and hairspring
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United States of America Patent
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Sep 15, 2015
Grant Date -
Jul 10, 2014
app pub date -
Sep 4, 2012
filing date -
Sep 7, 2011
priority date (Note) -
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Abstract
A timepiece movement includes a balance-and-hairspring regulator and an escapement co-operating with the regulator, the outer turn (5) of the hairspring including a stiffened portion (6′; 6″; 6″′) arranged to make the development of the hairspring more concentric, is characterized in that the stiffened portion (6′; 6″; 6″′) is also arranged to at least partially compensate for the variation in the rate of the movement in dependence upon the oscillation amplitude of the balance caused by the escapement.
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